The application of telecommunication technology to support data transmission and case management in nationwide computer-assisted personal interviewing (CAPI) could have a broad impact in the survey research industry. Significant potential exists for timely data capture, tight centralized controls, operation efficiencies and cost savings afforded by such an application. However, all national CAPI field efforts to date have used the U.S. Postal Service for data transmission and case management. This is due in part to researcher concerns about such issues as telecommunication reliability, data quality, data security, cost, and system support capability. The National Opinion Research Center (NORC) implemented an automated data transmission and case management system for the 1990 round of the NLSY. The system was used to support automated telecommunications from a nationally distributed field staff responsible for interviewing approximately 2,700 respondents using CAPI over a five-month field period. This paper presents the NORC automated CAPI support system capabilities, design, and implementation techniques. Strategies for addressing specific problems such as case management, case assignment changes, questionnaire modifications, system security and support are also described. The discussion culminates in a critical evaluation of NORC's project experience with emphasis on the feasibility of future CAPI telecommunication applications and suggestions for system improvements and enhancements.